why does my Volkswagen Passat B8 (2015-2022) have a check engine light and P0302 code?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting the work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 2 (refer to the engine layout).
• Use the spark plug socket to remove the spark plug.
• Inspect the spark plug for signs of wear, fouling, or damage.
• If necessary, install a new spark plug, ensuring it is gapped correctly (usually 0.028-0.032 inches).
• Torque the spark plug to the manufacturer's specifications (typically around 22 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set
• Disconnect the electrical connector from the ignition coil on cylinder 2.
• Remove the bolts securing the ignition coil and pull it out.
• Inspect the ignition coil for cracks or carbon tracking.
• Replace with a new ignition coil if damaged.
• Reconnect the electrical connector and secure the coil with bolts.

4. Check Fuel Injector

• Tools Required: Fuel pressure gauge, multimeter
• Disconnect the fuel injector connector.
• Use a multimeter to check for proper voltage and resistance.
• If the injector is faulty, replace it with a new one.
• Reconnect the injector and ensure it is secure.

5. Perform Compression Test

• Tools Required: Compression gauge
• Remove the spark plug from cylinder 2.
• Insert the compression gauge into the spark plug hole.
• Crank the engine a few times and record the pressure reading.
• Compare the reading to the manufacturer's specifications; if low, further investigation is needed.